INRA, UMR1260 «Nutriments Lipidiques et Prévention des Maladies Métaboliques», Marseille F-13385, France.
J Nutr Biochem. 2011 Jul;22(7):642-8. doi: 10.1016/j.jnutbio.2010.04.016. Epub 2010 Oct 16.
Obesity is associated with a low-grade inflammation which is correlated with an increased secretion of pro-inflammatory cytokines and chemokines by adipose tissue, suspected to contribute to the development of insulin resistance. Because lycopene is mostly stored in adipose tissue and possesses anti-inflammatory properties, we hypothesize that lycopene could reduce the production of proinflammatory markers in adipose tissue. In agreement with this hypothesis, we observed a decrease of inflammatory markers such as IL-6, MCP-1 and IL-1β at both the mRNA and protein level when explants of epididymal adipose tissue from mice fed with a high-fat diet were incubated with lycopene ex vivo. The same effect was reproduced with explants of adipose tissue preincubated in lycopene and then subjected to TNFα stimulation. The contribution of adipocytes and preadipocytes was evaluated. In both preadipocytes and differentiated 3T3-L1 adipocytes, lycopene preincubation for 24 h decreased the TNFα-mediated induction of IL-6 and MCP-1. Finally, the same results were reproduced with human adipocyte primary cultures. The molecular mechanism was also studied. In transient transfections, a decrease of the luciferase gene reporter under control of NF-κB responsive element was observed for cells incubated in the presence of lycopene and TNFα compared to TNFα alone. The involvement of the NF-κB pathway was confirmed by the modulation of IKKα/β phosphorylation by lycopene. Altogether, these results showed for the first time a limiting effect of lycopene on adipose tissue proinflammatory cytokine and chemokine production. Such an effect could prevent or limit the prevalence of obesity-associated pathologies, such as insulin resistance.
肥胖与低度炎症有关,这种炎症与脂肪组织中促炎细胞因子和趋化因子的分泌增加有关,据推测这有助于胰岛素抵抗的发展。由于番茄红素主要储存在脂肪组织中,并具有抗炎特性,我们假设番茄红素可以减少脂肪组织中促炎标志物的产生。与这一假设一致,我们观察到,当用高脂肪饮食喂养的小鼠的附睾脂肪组织外植体在体外与番茄红素孵育时,炎症标志物如 IL-6、MCP-1 和 IL-1β 的 mRNA 和蛋白水平均下降。用预先用番茄红素孵育然后用 TNFα 刺激的脂肪组织外植体也产生了同样的效果。评估了脂肪细胞和前脂肪细胞的贡献。在前脂肪细胞和分化的 3T3-L1 脂肪细胞中,番茄红素预孵育 24 小时可降低 TNFα 介导的 IL-6 和 MCP-1 的诱导。最后,在人原代脂肪细胞培养物中也得到了同样的结果。还研究了分子机制。在瞬时转染中,与单独用 TNFα 孵育的细胞相比,用番茄红素和 TNFα 孵育的细胞中 NF-κB 反应元件控制的荧光素酶基因报告减少。通过番茄红素对 IKKα/β 磷酸化的调节,证实了 NF-κB 途径的参与。总之,这些结果首次表明番茄红素对脂肪组织促炎细胞因子和趋化因子的产生具有限制作用。这种作用可以预防或限制肥胖相关病理的发生,如胰岛素抵抗。